Rating: Summary: Great value Review: These headphones are a great value at $30. The outside noise reduction appears to be accomplished in three manners. The first is by having earphones that "seal" well around one's ears. The second is by slightly elevating the pitch of the music etc that you are listening to. The third is by the addition of a "white noise overlay" that results in a slightly perceptable hum. There doesn't appear to be any active noise cancellation such as in the Bose headphones. Functionally I believe the noise reduction of the Creative HN-505 to be very good. The sound quality with the noise reduction turned off is also excellent. I have used the Bose and while the Bose are definitely better I can't justify the price differential between the two based on performance. If you are in the market for a noise reducing headphone at a bargain price I highly recommend the Creative NH-505.
Rating: Summary: Adequate for the price Review: With the price below $30 for a Noise-cancellation headphone, it does what it supposes to do. For my information, Noise-reduction is a more appropriate word describing this headphone, since I don't think there is one headphone that can eliminate outside noise totally, even those with price over hundreds of bucks. So why not giving a try to this nice and light one at first and having some impression of what on earth Noise-reduction feature can bring you. Although there is kind of humming sound while the Noise-reduction feature is on, it's not so loud that I can barely live with it. it's comfortable wearing over head since it's light. It's easy to carry around since it's collapsible and comes with a travel bag. I am going to love it anyway.